Thermostat welding Po use Note: Thermostat welding Po when used to preheat, preheat to the vent to smoke after welding, soldering iron tip location and welding position must be viscous dilute hydrochloric acid or Soldering liquid, so that the welding will be strong, high-power heating core is to ensure high temperature to ensure a solid weld, and copper must be copper, and only copper can be linked to the tin can be welded, when there is a stop in the middle of welding, Electric iron regulator down a bit, so that the temperature will not drop, it will not dry, to ensure the life of the iron!